Document Details
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Title:
THE RELATIVE EFFECTS OF X-RAYS, GAMMA RAYS AND BETA RAYS ON CHROMOSOMAL BREAKAGE IN TRADESCANTIA ( GENETICS, VOL 38, NO 4, JULY 1953, PAGES 375-388 ) ( PARTIAL DOCUMENT )
Author(s):
DANIELS, D S [OAK RIDGE NATIONAL LABORATORY]; KIRBYSMITH, J S [OAK RIDGE NATIONAL LABORATORY]
Subject Terms:
HREX
Document Location:
Location - DOE/NNSA NUCLEAR TESTING ARCHIVE Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - NTA@NV.DOE.GOV
Document Type:
JOURNAL ARTICLE
Publication Date:
1953 Jul 31
Declassification Status:
Never classified
Document Pages:
0014
Accession Number:
NV0702324
OpenNet Entry Date:
1994 Aug 27
OpenNet Modified Date:
2017 Dec 21
Description/Abstract:
THIS PAPER DISCUSSES THE RELATIVE EFFECTS OF X-RAYS, GAMMA RAYS AND BETA RAYS ON CHROMOSOMAL BREAKAGE IN TRADESCANTIA. THE EFFECTS OF MIXED 1.17 AND 1.33 MEV GAMMA RAYS FROM 60CO, MEDIUM X-RAYS (60-250 KEV) AND 32P BETA RAYS (MEAN ENERGY 400 KEV) ON CHROMOSOMAL BREAKAGE IN TRADESCANTIA HAVE BEEN COMPARED. X-RAYS OF 60 KEV MEAN ENERGY ARE TWICE AS EFFECTIVE AS 60CO GAMMA RAYS OR 400 KEV MEAN ENERGY BETA RAYS IN PRODUCING CHROMOSOMAL ABERRATIONS. ONE MEV GAMMA RAYS AND 400 KEV MEAN ENERGY BETA RAYS ARE CLOSELY IDENTICAL IN THEIR BIOLOGICAL EFFECTS ON TRADESCANTIA DRY POLLEN. A DEFINITE NONLINEAR COMPONENT IN THE DOSE-ABERRATION FREQUENCY RELATION FOR ISOCHROMATID BREAKS HAS BEEN OBSERVED FOR THE THREE DIFFERENT AGENTS. THIS RESULT INDICATES A DEFINITE TWO-HIT COMPONENT IN THE ABERRATIONS PRODUCED. AN ANALYSIS OF THE ISOCHROMATID DOSE-ABERRATION FREQUENCY FOR THE THREE RADIATIONS SHOWS THE RELATIVE MAGNITUDE OF THE TWO-HIT COMPONENT TO BE CONSIDERABLY GREATER FOR GAMMA RAYS OR HIGH ENERGY BETA RAYS THAN FOR MEDIUM ENERGY X-RAYS.